Across
- 2. Quick back-and-forth movement that produces sound.
- 8. Unwantedor unpleasant sound.
- 9. The distance a vibrating object moves.
- 10. Hard surfaces send sound back; they ______ it.
- 12. How high or low a sound is.
- 13. Whatsound needs in order to travel
- 15. Material that reduces sound energy.
Down
- 1. Unit used to measure loudness.
- 3. The strength or loudness of a sound.
- 4. Vibrations that are organized can make this.
- 5. Noisethat is harmful to health.
- 6. Soft surfaces soak up sound; they ______ it.
- 7. Empty space where sound cannot travel.
- 11. When sound waves bounce back.
- 14. Statematter through which we usually hear sound.
- 16. Problems caused by loud sound can include hearing _____.